Help! What should I do?

Are you certain that you can't sit for the exams at a later date? It the information didn't come directly from the school, don't believe it. First check it out and get the official information. Then tell your parents. Why put off the inevitable ? Why make it worse by deceiving them? Then get busy and find a job or another school that will accept you. Your parents sound like very understanding people if they haven't blown up over the 2 letters that you have received. They must love you a lot. Don't let them down.